Please check generated message in the correspondent email queue, en_email_message, record.If this message contains <LIST.txt> there, it would mean that email message is created successfully, and the problem is caused by either SMTP gateway or email client.

apugazhenthy wrote:As per my understanding during the HTML parsing only "<LIST.txt>" get cut in the email body.Could you please provide your view and solution for this issue.

Since you are using HTML, you need to replace special characters with escape sequence.For instance, "<" should be replaced in HTML message with "&lt;" and ">" with "&gt;"It can be easily achieved using user-defined function.